William Henry Pettett (4 September 1814 - 2 December 1871) was an English-born Australian politician who served as the Mayor of Hawthorn and as a member of the Legislative Council of Victoria for Southern Province.

He settled in Little River and became a shepherd and in 1838 he was hired as a manager for William John Turner Clarke working for him until 1842.

In November 1864 he was elected to the Legislative Council of Victoria for Southern Province and served in the role until 1871.

He suffered a lengthy illness in 1871 and died on December 4.

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